Synthesis and characterization of tetradentate N2O2 Schiff base ligands and their transition metal complexes

Abstract

Two new ligands, 1,2-propylimino-bis(isonitroso-2-acetylnaphthalene) (H2L1) and 1,2-ethyl-imino-bis(isonitroso-2-acetylnaphthalene) (H2L2), have been synthesized by the reaction of isonitroso-2-acetylnaphthalene with 1,2-diaminopropane or 1,2-diamino-ethane. These ligands were reacted with nickel(II), copper( II), cobalt( II), zinc( II), cadmium( II) and mercury( II) ions to form complexes containing tetradentate Schiff bases. Each metal ion is in a four-coordinate environment of two imine nitrogen atoms and two oxime oxygen atoms. The new compounds have been characterized by elemental analyses, magnetic susceptibility, mass, IR, H-1 and C-13 NMR spectroscopy.